Chat and hack with other Rails developers. If you want to code, take a look at http://www.tokyorails.org/collaborate and join any project that you're interested in.
July 4th Schedule:
19:30 - Doors Open
20:00 - Food, Drinks & Lightning Talks
- 20:45 - BDD: Live coding with @cwabbott
21:00 - Collaborate! Code, Hack, Learn
22:00 - Close
Note that the main doors close at 8pm, so be sure to arrive before then!